Throttle-valve mechanism for steam-engines.



No. 881,486 PATENTED MAR. 10, 1908,

G. BLPBTSGHE.

THROTTLE VALV E MECHANISM FOR STEAM ENGINES.

APPLICATION FILED MAR. 26, 1906.

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PATENTED MAR.10, 1903.

0 I G. B; PETSGHE.

THROTTLE VALVE MECHANISM TOR STEAM ENGINES.

APPLIOATION'IILBD MAR. 26, 1906. v

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UNITED STATES PATENT OFFICE. GUSTAV B. PETSOHE, OF PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO SOUTHWABK FOUN- DRY AND MACHINE COMPANY, OFPHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

THROTTLE-VALVE MECHANISM FOR STEAM-ENGINES.

To all whom it may concern:

Be it known that I, GUSTAV B. PETSOHE, a subject of the Emperor ofGermany, residing in the city and county of Philadelphia, in the Stateof Pennsylvania, have invented a certain new and useful Improvement inThrottle-Valve Mechanism for Steam-Engines, of which the following is atrue and exact description, reference being had to the accompanyingdrawings, which form a part thereof.

My invention relates to throttle valves employed for cutting off thesupply of steam to the valve chests of steam engines and has for itsobject to provide eflicient mechanism for closing such valves with greatcertainty and speed when the engine exceeds a determined rate of speedand also to provide for a convenient reopening of such valves.

In a broad sense my present invention comprises some of the featuresdescribed and claimed in my copending application for Letters Patentfiled March 26, 1906 Serial Number 308001, my resent invention beingdirected to the specia features by which the closing and opening of sucha valve can be efiected by steam power in connection with the emergencygovernor mechanism for setting the closing devices inoperation on theoccurrence of the contemplated emergency.

The nature of my invention and the various features of construction willbe best understood as described in connection with sectional viewsillustrating the valve forming a detail of construction and Fig. 7 is aside elevation showing my emergency valve in connection with a secondhand actuated throttle valve situated below it.

A, is the casing of the throttle valve having a gridiron annular seatfor the valve consisting of a central hub B with radial webs B thecentral hub being continued up Specification of Letters Patent.

Application filed March 26, 1906.

Patented March 10, 1908.

Serial No. 308,002.

C, is the circular gridiron valve pivoted on the pin B and resting onthe webs 13*. At one edge this valve is formed with a tooth segmentindicated at C D the cylinder connected with and preferably formedintegral with the valve casing the inner end of this cylinder connectingthrough a port D with the live steam space of the casing.

E is a piston working in the cylinder and having attached to it thepiston rod E, on which rod are formed teeth indicated at E in engagementwith the toothed segment'C, on the edge of the valve. A head IE attachedto the end of the rod is pivotally connected to the lever H pivoted at Hand having. a handle H Under normal conditions the piston is held at thefront end of the cylinder and the valve held 0 en by the engagement of adetent H on t e lever H, with a detent I, on a lever I, pivoted at I,and having a handle I said lever I, having an arm I, which projects intoclose proximity to the oscillating emergency governor to be describedand so as to be actuated by said governor under proper conditions.

J, is a stud shaft secured to the casing on which is pivoted theoscillating governor K, preferably formed in the shape of a wheel asshown and having on one side a recess K in which lies an arm L pivotedat one end on a pin K in the rear of which the arm is cut away asindicated at L, to fpermit a certain Fig. 2).

M is a lever arm attached .to the hub of the governor wheel and by whichit is actuated, being connected to some reciprocating or oscillatingpart of the engine as described in my before mentioned copendingapplication. The rear end of the cylinder E is connected with a livesteam space by a conduit F, F

in which issituated the plug cock casing F,:

and from which extends the branch pipe F entering into the casing on thelower s1de of the throttle valve. Under normal conditions the plug cockindicated at G, is closed, as shown 1n Fig. 5, and when opened itconnectsthe pipe F, with both the pipes F and F as shown in Fig. 6. Thecock G, is actuated through a shaft G, by a weighted lever G the weightof which normally keeps the valve or cook closed. v

Under normal conditions when valve is opened and the ports in theposition shown in the various drawings when through some accident thespeed of the engine exceeds a predetermined amount, the s ring N",yields to the centrifugal tendency of the governor arm L, permitting theend U, of this arm to project so that it strikes against the arm I, ofthe lever I, forcing this arm up and the other arm of the lever downreleasing the latch lever H, whereupon the pressure of steam on the faceof the piston E, at once causes it to move inward in the cylinder D, andthrough its toothed segment E to close the valve C.

Where the pressure involved is not great the valve can be opened and theparts set in normally latched position by drawing out- Ward the lever H,but this is best accomplished by opening the plug cock G, and admittingsteam to the rear end of the cylinder '1), balancing the pressure on thepiston E, or somewhat exceeding the pressure on the front of saidpiston, so that the piston will either automatically or through slightassistance from the hand lever H, be brought to open position.

In cases where the full pressure of live steam remains on the face ofthe valve C, as for instance, where the supplemental throttle valve 0,is situated below the casing A, .as

shown in Fig. 7, it is advisable to provide means for balancing thepressure on the valve C, and this I accomplish by the branch pipe Fwhich, when the plug cock G, is opened, admits live steam below thevalve C, and balances the pressure on both faces of this valve.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is 1. A throttle valve for steam engines,comprising a valve casing, a valve for opening and closing the steampassage in the same, a steam cylinder open at one end to the live steamspace, a steam pipe leading from the live steam space to the other endof the cylinder, a valve'for opening and closing said pipe, a pistonworking in said cylinder and connected to actuatethe valve, catchmechanism whereby the piston is normally held in position to hold thethrottle valve open, and an emergency governor adapted to act as areleasing device forsaid catch mechanism.

2. A throttle valve for steam engines comprising a valve casing, a valvefor opening and closing the steam passage in the same, a steam cylinderopen at one end to the live steam space, a steam pipe leading from thelive steam space to the other end of the cylinder, said pipe having abranch leading to the casing below the valve seat, a valve for openingand closing said. pipe, a piston working in said cylinder and connectedto actuate the valve, catch mechanism whereby the piston is normallyheld in position to hold. the throttle valve open, and an emergencygovernor adapted to act as a releasing device for said catch mechanism.

3. A throttle valve for steam engines having in combination a valvecasing with a seat for a slide valve, a slide valve working on saidseat, a cylinder having one end in free connection with the live steamspace, a piston working in said cylinder and connected to actuate thevalve, a piston rod, catch mechanism acting to engage the piston rod andthrough it hold. the valve open and an emergency governor arranged toact as a catch releasing device.

4. A throttle valve for steam engines having in combination a valveeasing with a seat for a slide valve, a slide valve working on saidseat, a cylinder having one end in free connection with the live steamspace, a steam pipe connecting the other end of the cylinder also withthe live steam space, a valve for opening and closing said conduit, apiston working in said cylinder and connected to actuate the valve, apiston rod. catch mech anism acting to engage the piston rod and throughit hold the valve open and an emergency governor arranged to act as acatch releasing device.

5. A throttle valve for steam engines having in combination a valvecasing with a seat for a slide valve, a slide valve working on saidseat, a cylinder having one end in free connection with the live steamspace, a steam pipe connecting the other end of the cylinder also withthe live steam space, said pipe having a branch extending into thecasing below the slide valve, a valve for opening and closing saidconduit, a piston working in said cylinder and connected to actuate thevalve, a piston rod catch mechanism acting to engage the piston rod andthrough it hold the valve open and an emergency governor ar ranged toact as a catch releasing device.

GUSTAV B. PE'lSCllE.

Witnesses ARNOLD KATZ, D. STEWART.

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